okay this one has given me and half a dozen other members of staff the red ass... take a look at the pics below.. the reflection is a simple giant area light reflecting in the car bodywork but as you can see the reflection is broken in its continuity. I've attached a render and a couple of pics of wireframes.
one of the guys who models cars instantly claimed vertex normals are the issue so i sat about tweaking those - however Mental Ray doesn't care when rendering the model once i've switched to smooth mesh. there's no difference.
another of the guys even took the model and tried all manner of poly editing - combining the two together and still got no luck.
as a test i turned both the door and the rear quarter into one smooth panel.. this is the result below... however this isn't ideal at all as i need to have the door separate...
Can anyone suggest anything that may help with this? I'm using the carpaint shader on the car btw.
Is there some setting in Mental Ray or some kind of lens shader that will assist with this? I've been battling this issue for days.
any thoughts and advice welcome